AS/NZS 4645.2:2008
Gas distribution networks - Steel pipe systems
To provide for the protection of the general public, gas distribution network operating personnel and the environment, and to ensure safe and reliable operation of gas distribution networks that reticulate gas to consumers. It covers steel piping within gas distribution networks covered by AS/NZS 4645.1, where the maximum allowable operating pressures up to or equal to 1050 kPa and the hoop stress is less than or equal to 20% SMYS of the pipe. Steel piping systems for gas outside these limits are generally covered by the AS 2885 suite of Standards and for some jurisdictions. AS/NZS 4645.1 provides for limited use up to 1965 kPa.
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AS/NZS 4645.2:2008 GAS DISTRIBUTION NETWORKS - STEEL PIPE SYSTEMS
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 EXCLUSIONS
1.3 REFERENCED DOCUMENTS
1.4 RECORDS
1.5 DEFINITIONS
SECTION 2 MATERIALS AND COMPONENTS
2.1 GENERAL
2.2 NEW MATERIALS AND NEW COMPONENTS
2.3 RECLAIMED MATERIALS AND RECLAIMED COMPONENTS
2.4 MATERIALS AND COMPONENTS IDENTIFICATION
2.5 PIPE THREADS, THREADED PIPE FITTINGS, FLANGED PIPE JOINTS AND WELDED PIPE JOINTS
2.6 VALVES, FITTINGS AND ACCESSORIES
2.6.1 General
2.6.2 Flanges and flanged fittings
2.6.3 Gaskets and ring joints
2.6.4 Valves
2.7 COATING FOR BURIED METAL MAINS OR SERVICES
SECTION 3 DESIGN
3.1 GENERAL
3.2 MAXIMUM ALLOWABLE OPERATING PRESSURE (MAOP)
3.3 HOOP STRESS
3.4 WALL THICKNESS
3.4.1 Pipe
3.4.2 Steel casing
3.5 CORROSION MITIGATION
3.5.1 General
3.5.2 Insulating joints
3.5.3 Casing pipe
3.6 SUPPORTS
3.6.1 Anchoring
3.6.2 Flexibility
3.6.3 Vibration
3.6.4 Material for supports
3.6.5 Forces on pipe joints
3.6.6 Attachment of supports or anchors
3.6.7 Interference
3.6.8 Insulation
3.7 BENDS, ELBOWS AND MITRES
3.8 EXPANSION AND FLEXIBILITY
SECTION 4 WELDING
4.1 GENERAL
4.2 DESIGN OF A WELDED JOINT
4.2.1 Dimensions of a fillet-welded repair sleeve
4.2.2 Socket weld
4.3 VISUAL EXAMINATION OF IN-SERVICE WELDS
SECTION 5 CONSTRUCTION AND INSTALLATION
5.1 HANDLING
5.1.1 Storage
5.1.2 Transportation
5.1.3 Lifting
5.1.4 Stresses induced during laying
5.2 PROTECTION
5.2.1 Covering ends
5.2.2 Cleaning internally
5.2.3 Electrically insulated joints
5.3 POSITIONING
5.3.1 Alignment
5.3.2 Structures
5.3.3 Separation from other utility assets
5.4 BURYING
5.4.1 Cover requirements and underground protection
5.4.2 Width of trenches
5.4.3 Grading
5.4.4 Padding
5.4.5 Protection of coatings
5.4.6 Directional drilling
5.4.7 Support and lowering of mains or services
5.4.8 Backfilling
5.4.9 Reinstatement
5.4.10 Electrical hazards
5.4.11 Coating
5.5 ITEMS TO BE INSPECTED
5.6 MARKERS
5.7 COMPONENTS AND FABRICATED ASSEMBLIES
SECTION 6 PRESSURE TESTING
6.1 GENERAL
6.2 TEST PROGRAM
6.3 SAFETY
6.4 TEST PRESSURES
6.4.1 Minimum test pressure
6.4.2 Maximum test pressure
6.4.3 Testing at operating pressure
6.5 LEAK TESTING
6.5.1 General
6.5.2 Preparation of the test section
6.5.3 Preparation of the testing equipment
6.5.4 Pressurization
6.5.5 Test procedure
6.5.6 Hold period
6.5.7 Assessment of pressure test
6.6 DISPOSAL OF TEST FLUID
6.7 REPORTS AND RECORDS
SECTION 7 COMMISSIONING
7.1 GENERAL
7.2 PLANNING
7.3 PURGING (INTRODUCTION OF COMBUSTIBLE GAS)
SECTION 8 MAINTENANCE
8.1 GENERAL
8.2 CORROSION PROTECTION SYSTEMS
8.3 ELECTRICAL HAZARDS
8.4 REPAIRS
8.4.1 General
8.4.2 Mains
8.4.3 Services
8.4.4 Maintenance and repair of coating on above-ground pipework
APPENDIX A - REFERENCED DOCUMENTS
APPENDIX B - APPLICATION OF VARIOUS TYPES OF TEST EQUIPMENT
B1 GENERAL
B2 VOLUMETRIC DISPLACEMENT METHODS
B3 PRESSURE LOSS METHODS
APPENDIX C - DIRECT PURGING METHODS.
C1 GENERAL
C2 DIRECT PURGING
C2.1 Overview
C2.2 Staged and gradual approaches
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Related Information
Gas (Safety And Measurement) Regulations 2010
Ministry: WorkSafe New Zealand: Energy Safety
Section: Schedule 1
Citation context:AS/NZS 4645 is the New Zealand Standard known as AS/NZS 4645:2008 (Gas distribution networks Parts 1, 2, and 3) including Amendments 1, 2 and A
Gas (Safety And Measurement) Regulations 2010
Ministry: WorkSafe New Zealand: Energy Safety
Section: 27(2)
Citation context:27 Duties of owners and operators of distribution systems in relation to work carried out on systems (2) Compliance with NZS 5258 or AS/NZS 4645 is deemed to be compliance with this regulation.
Gas (Safety And Measurement) Regulations 2010
Ministry: WorkSafe New Zealand: Energy Safety
Section: 26(3)
Citation context:26 Owners and operators of distribution systems must ensure continuity of supply and safety (3) Compliance with Part 2 (steel pipe systems) and Part 3 (plastic pipe systems) of AS/NZS 4645 is also deemed to be compliance with subclause (1).
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AS/NZS 4645.1:2018
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Gas distribution networks - Part 2: Steel pipe systems -
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AS/NZS 4645.2:2008 GAS DISTRIBUTION NETWORKS - STEEL PIPE SYSTEMS
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 EXCLUSIONS
1.3 REFERENCED DOCUMENTS
1.4 RECORDS
1.5 DEFINITIONS
SECTION 2 MATERIALS AND COMPONENTS
2.1 GENERAL
2.2 NEW MATERIALS AND NEW COMPONENTS
2.3 RECLAIMED MATERIALS AND RECLAIMED COMPONENTS
2.4 MATERIALS AND COMPONENTS IDENTIFICATION
2.5 PIPE THREADS, THREADED PIPE FITTINGS, FLANGED PIPE JOINTS AND WELDED PIPE JOINTS
2.6 VALVES, FITTINGS AND ACCESSORIES
2.6.1 General
2.6.2 Flanges and flanged fittings
2.6.3 Gaskets and ring joints
2.6.4 Valves
2.7 COATING FOR BURIED METAL MAINS OR SERVICES
SECTION 3 DESIGN
3.1 GENERAL
3.2 MAXIMUM ALLOWABLE OPERATING PRESSURE (MAOP)
3.3 HOOP STRESS
3.4 WALL THICKNESS
3.4.1 Pipe
3.4.2 Steel casing
3.5 CORROSION MITIGATION
3.5.1 General
3.5.2 Insulating joints
3.5.3 Casing pipe
3.6 SUPPORTS
3.6.1 Anchoring
3.6.2 Flexibility
3.6.3 Vibration
3.6.4 Material for supports
3.6.5 Forces on pipe joints
3.6.6 Attachment of supports or anchors
3.6.7 Interference
3.6.8 Insulation
3.7 BENDS, ELBOWS AND MITRES
3.8 EXPANSION AND FLEXIBILITY
SECTION 4 WELDING
4.1 GENERAL
4.2 DESIGN OF A WELDED JOINT
4.2.1 Dimensions of a fillet-welded repair sleeve
4.2.2 Socket weld
4.3 VISUAL EXAMINATION OF IN-SERVICE WELDS
SECTION 5 CONSTRUCTION AND INSTALLATION
5.1 HANDLING
5.1.1 Storage
5.1.2 Transportation
5.1.3 Lifting
5.1.4 Stresses induced during laying
5.2 PROTECTION
5.2.1 Covering ends
5.2.2 Cleaning internally
5.2.3 Electrically insulated joints
5.3 POSITIONING
5.3.1 Alignment
5.3.2 Structures
5.3.3 Separation from other utility assets
5.4 BURYING
5.4.1 Cover requirements and underground protection
5.4.2 Width of trenches
5.4.3 Grading
5.4.4 Padding
5.4.5 Protection of coatings
5.4.6 Directional drilling
5.4.7 Support and lowering of mains or services
5.4.8 Backfilling
5.4.9 Reinstatement
5.4.10 Electrical hazards
5.4.11 Coating
5.5 ITEMS TO BE INSPECTED
5.6 MARKERS
5.7 COMPONENTS AND FABRICATED ASSEMBLIES
SECTION 6 PRESSURE TESTING
6.1 GENERAL
6.2 TEST PROGRAM
6.3 SAFETY
6.4 TEST PRESSURES
6.4.1 Minimum test pressure
6.4.2 Maximum test pressure
6.4.3 Testing at operating pressure
6.5 LEAK TESTING
6.5.1 General
6.5.2 Preparation of the test section
6.5.3 Preparation of the testing equipment
6.5.4 Pressurization
6.5.5 Test procedure
6.5.6 Hold period
6.5.7 Assessment of pressure test
6.6 DISPOSAL OF TEST FLUID
6.7 REPORTS AND RECORDS
SECTION 7 COMMISSIONING
7.1 GENERAL
7.2 PLANNING
7.3 PURGING (INTRODUCTION OF COMBUSTIBLE GAS)
SECTION 8 MAINTENANCE
8.1 GENERAL
8.2 CORROSION PROTECTION SYSTEMS
8.3 ELECTRICAL HAZARDS
8.4 REPAIRS
8.4.1 General
8.4.2 Mains
8.4.3 Services
8.4.4 Maintenance and repair of coating on above-ground pipework
APPENDIX A - REFERENCED DOCUMENTS
APPENDIX B - APPLICATION OF VARIOUS TYPES OF TEST EQUIPMENT
B1 GENERAL
B2 VOLUMETRIC DISPLACEMENT METHODS
B3 PRESSURE LOSS METHODS
APPENDIX C - DIRECT PURGING METHODS.
C1 GENERAL
C2 DIRECT PURGING
C2.1 Overview
C2.2 Staged and gradual approaches
AS/NZS 4645.2:2008
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.